Chen, Z., Chen, J., Zhou, J., Lei, F., Zhou, F., Qin, J., Zhang, X., Zhu, L., Liu, Y., Wang, H., Chen, M., Zhao, Y., Xie, J., Shen, L., Song, X., Zhang, X., Yang, C., Liu, W., Zhang, X., Guo, D., Yan, Y., Liu, M., Mao, W., Liu, L., Ye, P., Xiao, B., Luo, P., Zhang, Z., Lu, Z., Wang, J., Lu, H., Xia, X., Wang, D., Liao, X., Peng, G., Liang, L., Yang, J., Chen, G., Azzolini, E., Aghemo, A., Ciccarelli, M., Condorelli, G., Stefanini, G. G., Wei, X., Zhang, B., Huang, X., Xia, J., Yuan, Y., She, Z., Guo, J., Wang, Y., Zhang, P., & Li, H. (2021). a risk score based on baseline risk factors for predicting mortality in COVID-19 patients. Current medical research and opinion, 37, 917–927. http://access.bl.uk/ark:/81055/vdc_100130767290.0x00004b